Research on Trivalent Chromium Removal from Wastewater by Gas Quenching Steel Slag
Gas quenching steel slag (GQSS), which was prepared by gas quenching equipment under inert atmosphere, possessed some advantages for pollutants removal from wastewater. Static state experiment has been carried on to investigate Cr(III) removal from wastewater by GQSS. The results indicated that solid-liquid ratio, Cr(VI) original concentration, libration time and dissolved oxygen have significant influence on Cr(III) removal percentage. Take economic cost into account, the ratio between the mass of GQSS and the volume of Cr(III)-bearing solution should be controlled at 3:100. Because Cr(III) removal from wastewater by GQSS went through absorption and precipitation, the removal percentage of Cr(III) increased gradually with the reaction time. Moreover, Cr(III) removal percentage declined with the increasing of Cr(III) original concentration. Along with the declining of dissolved oxygen under sealed with lid, the redox potential in the solution decreased, and then the removal percentage of Cr(III) increased.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
J. G. Li et al., "Research on Trivalent Chromium Removal from Wastewater by Gas Quenching Steel Slag", Advanced Materials Research, Vols. 287-290, pp. 3069-3073, 2011